Attachment for sewing machines



P. I. PANKOFF ATTACHMENT FOR SEWING MACHINES Filed Feb. '7, 1925 IN V EN TOR.

TORNEY Patented Feb. 2, 1926.

UNITED STATES PATENT OFFICE.

PANTELEIMON I. PANKOFF, OF NEW YORK, N. Y.

ATTACHMENT FOR snwme MACHINES.

Application filed February 7, 1925. Serial No. 7,493.

be attached to a bobbin-holder and actuated v by the bobbin-holder rotating means.

One object of the invention is to provide a removable thread-twisting hook adapted to be attached to and rotatable with the spring-pressed portion of the bobbin-holder, to twist strands of thread, silk, or the like. to produce ornamental braid for garmenttrimming purposes, hats, &c.

Another object of the invention is to substitute a removable pin for the bobbin and which pin is adapted for location between the fixed and longitudinally-movable spring-pressed portions respectively of the bobbin-holder, so shaped that one of its ends will rest in the bobbin-locating depres sion of the fixed portion and the other end in a positioning groove in the longitudinally-movable spring-pressed portion, thus forming a unitary structure which with its associated parts is adapted to be actuated by the bobbin-rotating means to produce the desired result.

Another object of the invention is to provide a thread-twisting hook adapted for permanent attachment to the longitudinally movable spring-pressed portion of a bobbinholder and also adapted for operative engagement with and actuation by the bobbinrotating means.

Another object of the invention is to rovide a removable thread-twisting hook adapted for attachment to the rotary shuttle type of sewing-machines.

These and other objects of the invention not hereinbefore referred to will be hereinafter described and claimed and are illustrated in the accompanying drawing, in which Figure 1 is a perspective View on a re.- duced scale of a sewing-machine of wellknown type Withthe preferred embodiment of my invention attached thereto.

This invention relates to attachments for Fig. 2 is a front elevation of the thread twisting means of the invention.

, Fig. 3 is an end. elevation of the thread twisting hook.

Fig. t is a distended View showing the elements ofsaid thread-twisting hook.

Fig. 5 is a modified form of the threadtwisting hook.

v Fig. 6 is a plan view of a pin adapted to be positioned in and actuated by the bobbinholder to effect rotation of the. thread-twisting means.

Fig. 7 is a front elevation of thesame. Fig. 8 shows the means on the. hori Zontally-movableelement of a bobbin-holderfor positively positioning the pin of Figs. 2, (Sand 7.

Fig. 9 is an elevation showing the method of attaching the thread-twisting hook to a sewing-machine employing a rotary shuttle. Fig. 10 illustrates, a silk, thread or yarn braid made up of a plurality of twisted strands; and

Fig. 11 illustrates a, braidmadeup of two twisted braids as shown in Fig. 10; 7

Similar characters designate like parts in all the figures of the drawing.

Referring to the drawing, 2 designates the balance-wheel and 3 the bobbin-winding pulley of a sewing-machine of a well-known type, said pulley 3 being adapted for rota tion by the handle 1 upon frictional engage ment therewith of the balance-wheel 2.

Bobbin holding and winding means are shown herein as carried by a frame member 4 having journaled therein opposite portions 5 and 6 the former of which isrotated upon rotation of the puley 25. Said portion 6, journaled in the frame 4, is adapted for longitudinal movement, the spring 7 being compresed by pulling on the knob 8 to permit insertion of the bobbin-like pin 9 between the opposite portions 5 and 6. These portions with their associated parts constitute the bobbin-holder; For the purpose of this invention, the pin 9.is formed with a convex end 10 having a protuberance 11 formed thereon adapted to locate this end of the pin in the recess 11' of the concaveo end of the portion v5. The opposite end of thepin 9 is provided with a chisel-like edge 12 for positively, positioning said end in a slot 13 in the portion 6, the pin 9 being stopped from sidewise movement in the slot 13 by a projection 14 on the chisel-like edge 12 of the pin 9, and which projection is adapted to fit within a complementary recess 15 of the portion 6. Upon actuation of the bobbin-holder in the well-known manner, the pin 9 and the thread-twisting hook 17 will also be simultaneously actuated.

This hook 17 is attached to the knob 8 of the spring-pressed portion 6 and consistsof the members 18 and 19 adapted to engage about and be clamped to the knob 8 by the screw 20 or in any other suitable manner. When said members are so clamped and the bobbin-holder and its associated parts actuated by the bobbin-holder rotating -means, the hook 17 will be simultaneously actuated. lVhen it is desired to wind a bobbin in the usual way, the pin 9 and the hook 17 are removed and the bobbin substituted for the pin.

To twist strands of thread, silk or the like, to form ornamental braid for use as trimming on garments, hat's, &c., a plurality of strands of any desired combination of colors, are tied together at oncend, as at 21, and the looped portion adjacent to said end passed over the hook 17 the strands being held taut and the bobbin-holder rotating means actuated to rotate the bobbin-holder and its associated parts and simultaneously the said hook, and thus produce an ornamental braid. WVhen sufliciently twisted, the rotation of the device is stopped, the braid then appearing as shown at 22. Should it be desired to have a greater thickness of braid,

the latter is looped over the hook 17, as at 23, and the device once more rotated, in this instance, however, in the opposite direction, and this operation is repeated as often as may be necessary to produce braid of the required thickness, the braid being alternately twistedin opposite directions. As is obvious, the twisting-hook construction illustrated in Figs. 1, 2, 3 and 4 of the drawing and above described is intended for use with bobbin-holders of sewingmachines alread manufactured and in public use.

The thread-twisting hook 17, shown in Fig. '5, is made a permanent part of the longitudinally-movable spring-pressed portion 6 of the bobbin-holder applied to sewing machines in the course of construction and before the latter are marketed; while the thread-twisting hook 17 and its clamping members 18 and 19, respectively, shown in Fig. 9, are intended for use with the rotary shuttle type of. sewing-machines.

As numerous changes could be made in the above construction and many apparently widely different embodimentsof my invention designed without departing from the scope of the appended claims, I intend that all matter contained in the above description and the construction illustrated in the accompanying drawing shall be interpreted as illustrative merely of the preferred embodiments of my invention and not in a limiting sense.

W hat I claim is:

1. In a device of the class described, the combination with a bobbin-holder, of a pin adapted for attachment thereto and rotation thereby, and thread-twisting means fastened to the free end of said bobbin holder and rotatable therewith.

2. In a device ofthe class described, the combination with a bobbin-holder, of a pin adapted for attachment thereto and rotation thereby, thread-twisting means fastened to the free end of said bobbin-holder, and means for actuating the latter and its associated parts.

3. In a device of the class described, the combination with'a bobbin-holder, of a removable pin in frictional engagement at one end with said holder and a positive. engagement at its other end with said holder, thread-twisting means attached to the latter and rotatable therewith, and means for actuating the bobbin-holder and its associated parts I V 1. In a device of the class described, the combination with a bobbin-holder having a depressed portion and a spring-pressed portion provided with a slot, a positioned, removable pin in frictional engagement at one of its ends with said depressed portion and having its other end formed with a chisellike edge for positive engagement with the slot in said spring-pressed portion, a threadtwisting hook attached to and rotatable with said spring-pressed portion, and actuating means for said bobbin-holder and its associated parts.

' 5. In a device of the class described, the combination with a bobbin-holder having a depressed portion and a spring-pressed por tion provided with a slot, said slot having a recess, a positioned, removable pin in frictional engagement at one of its ends with said depressed portion and having its other end formed with a chisel-like edge for positive engagement with the slot in said spring pressed portion, a locating projection 011 said chiseled edge adapted to enter the recess in the slot of said spring-pressed portion, a thread-twisting hook attached to and rotatable with said spring-pressed portion and actuating means for said bobbin-holder and its associated parts.

6. In a device of the class described, the combination with a bobbin-holder having at one end a concaved portion provided with a recess and at the other end a spring-pressed portion with a slot also provided with a recess, a positioned, removable pin having a convex end for engagement with said concaved portion and the pin having its other end formed with a chisellike edge for engagement with the slot in said springpressed portion, a protuberance on said convex end adapted to enter the recess in said concaved portion, a locating projection on said chisel edge adapted to enter the recess in the slot of said spring-pressed portion, a removable thread-twisting hook fixed to the free end of and rotatable with said springpressed portion, and actuating means for said bobbin-holder and its associated parts.

7. In a sewing-machine, the combination with bobbin-holding means comprising a fixed element and a longitudinally-movable element, of a pin adapted for attachment to and rotatable with said elements, a threadtwisting hook attached to and rotatable With the longitudinally-inovable element, and means for actuating said bobbin-holding means and its associated parts.

8. In a sewing-machine, the combination with bobbin-holding means having a fixed element and a longitudinally-movable spring-pressed element, of a removable pin located between and adapted for attachment to and rotatable With said elements, a re movable thread-twisting hook formed integral to and rotatable with the longitudinally-movable spring-pressed element, and actuating means for rotating said bobbinholding means and its associated parts.

9. In a sewing machine, the combination with bobbin-holding means comprising a fixed portion and a longitudinally-movable portion, a pin located between said portions and adapted to be attached to and rotatable therewith, a loop-engaging hook attached. to the free end of the longitudinally-inovable portion and rotatable therewith, and actuating means for said bobbin-holding means and its associated parts.

In testimony whereof, I tlfilX my signature.

PANTELEIMON I. PA NKOFF.- 

